Análise de algoritmos de sincronização para conversores estáticos de potência.

Abstract

In electrical energy generation systems based on primary sources, such as wind or photovoltaic energy, static power converters are commonly used to connect directly to the electrical grid. These converters are responsible for the energy processing, adjusting it and delivering to the electrical grid. In order to get the converters to have satisfactory performance, these converters must be well projected and precisely controlled. When it refers to controlling, the synchronization in a three-phase system is very important to safe and well-performed operation in grid connected applications. The most used techniques in three-phase synchronization are based on PLL’s. In this academic work, it is presented a detailed study about different PLL structures that are based on coordinate transformation concepts to detect and track the frequency and the phase angle of the three-phase system voltages or electrical currents. Simulation results in ideal and non-ideal conditions are presented in order to analyze the behavior of each PLL structure in different conditions to which the grid may be submitted.